Select all units/elements from element's on_executed/unit list

[MiamiCenterPL]

I would like to see a button to select all linked element's unit / elements in the list, it can be useful to move all of them at once, or change their continent or properties.
https://i.imgur.com/BvRB8U6.png
This would work for the Linked by list also. Could be a two separate buttons, one for only units, one for only elements.